Classic ASP: Help with OAuth2 Token

I am stumped with setting up an API call to Xero Accounts using OAuth2, any assistance
would be really appreciated.

I can successfully logon and retrieve data using postman/paw

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I have my Server Action setup as follows (all values match)

Screenshot 2020-03-16 at 09.26.51780×2119 41.8 KB

Screenshot 2020-03-16 at 09.28.54776×1667 30.8 KB

Screenshot 2020-03-16 at 09.29.23764×2134 39.8 KB

I have a button that loads the server action, but when clicked or if I open the server action, nothing happens just the following error. ‘refresh’ is undefined

Screenshot 2020-03-16 at 09.30.341343×245 5.15 KB